Every universe, according to the theories this film lays out, eventually ends, and it walks through three ways that could happen. The first is a random quantum fluctuation, a sudden shift in the fabric of space that could rewrite or erase everything in an instant, with no warning. The second is a slow one, sometimes called a cosmic ice age: stars burn out, energy disperses, and matter drifts apart until the universe settles into permanent, absolute cold. The third has gravity winning outright, as black holes grow by consuming nearby matter and light until they dominate what is left of the cosmos. Scientists lay out the physics behind each scenario, using CGI renderings alongside telescope imagery of galaxies and stars to show what these endpoints would actually look like. The film does not pick a winner among the three; instead it treats them as competing, currently unresolved answers to the same question, working from the same evidence of an expanding, cooling universe.